In one of the audits I had to do for work, there was a need to figure out what processors were running in the Sun boxes. Since it’s really just not cost effective to go to each of the multiple switches and tear open the box to see physically, there had to be a way to see if there is indeed X number of processors and at what clock speed they are currently performing.
psrinfo -v will provide this information.
What’s interesting is that in later Solaris versions, (I’m not definite on 9, but definitely in version 10), prtdiag will give a much better looking output including memory and slots.
Unfortunately, with a stock Solaris installation, you need to take what comes with the system and this will assist you in cpu proc auditing.